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1.1 1 xml info:srw/schema/1/mods-v3.2 Liebermann D G author Goodman D author 1991 English While a common view is that vision is essential to motor performance, some recent studies have shown that continuous visual guidance may not always be required within certain time constraints. This study investigated a landing-related task (self-released falls) to assess the extent to which visual information enhances the ability to reduce the impacts at touchdown. Six individuals performed six blocked trials from four height categories in semi-counterbalanced order (5-10, 20-25, 60-65, and 90-95 cm) in vision and no-vision conditions randomly assigned. A series of two-way ANOVA with repeated measures were carried out separately on each dependent variable collapsed over six trials. The results indicated that vision during the flight did not produce softer landings. Indeed, in analysing the first peak (PFP) a main effect for visual condition was revealed in that the mean amplitude was slightly higher when vision was available (F(1,5) = 6.57; p less than 0.05), thus implicating higher forces at impact. The results obtained when the time to the first peak (TFP) was applied showed no significant differences between conditions (F(1,5) less than 1). As expected, in all cases, the analyses yielded significant main effects for the height categories factor. It appears that during self-initiated falls in which the environmental cues are known before the event, visual guidance is not necessary in order to adopt a softer landing strategy. Adult Analysis of Variance Biomechanics *Cues Humans Male Motor Activity/*physiology Psychomotor Performance/physiology Vision Ocular/*physiology PMID:1800107 exported from refbase (https://refbase.nfshost.com/show.php?record=55), last updated on Wed, 30 Jan 2013 09:14:25 +0000 text http://www.ncbi.nlm.nih.gov/pubmed/1800107 http://www.ncbi.nlm.nih.gov/pubmed/1800107 10.1080/00140139108964880 1800107 Liebermann+Goodman1991 1991 continuing periodical academic journal 34 11 1399 1406 0014-0139 1